For a switch or switchback of storage systems in a Storage Cluster, the failover and failback functions are deployed.
They can be processed automatically (in case of an error) or manually, depending on the setting for the Storage Cluster. The setting can be modified by ETERNUS SF.
The functions for the manual failover and the manual failback are integrated in SHC-OSD and are realized by the FAILOVER-STORAGE-CLUSTER and FAILOVER-STORAGE-CLUSTER commands.
The above mentioned commands affect all volumes in the Storage Cluster. The volumes may or may not be generated in BS2000. BS2000 resources (pubsets, volumes, mnemonics) are not checked.
A failover or failback of the Storage Cluster is reported on the BS2000 console with the NDE0080 and NDE0081 messages. This is internally handled by the Error Recovery of the BS2000 (for /390 servers) or Linux (for x86 servers).
A manual failover or failback should not be performed in parallel to replication command processing for volumes of the Storage Cluster. In case of concurring actions, failover and failback are prioritized.